Construction in water craft



' H. K. STACK 1,817,780

CONSTRUCTION IN WATER CRAFT Filed Oct 24. 1929 2Shets-Shee1. 1

4 Henry 672a 'INVENTOR Aug. 4, 1931. v H. K, STACK 1,817,780

CONSTRUCTION IN WATER CRAFT Filed 0ct.' '24. 1929 2 Sheets-Sheet 2 INVENTOR ATI'O Patented Aug 4, 1931 UNITED STATES HENRY'K. STACK, OF BORTLAND, OREGON CONSTRUCTION TIN WATER CRAFT Application filed October 24,4929. Serial No. 402,175.

The primary purpose and object of my device is to provide a boat of greatest ability and one that may be propelled through the water in maximum speed commensurate with the resistance ofi'ered to the passing of the same through the water.

The invention consists primarily of a plu- I The pontoons will be normally held submerged in rough weather as the boat is prop v construction, thesamehaving a plurality of pelled through the water, thereby stabilizing the boat and rendering it'substantially'u'ndisturbed by the roughened surface of the Water over which the same is being propelled.

The propeller being disposed central of the pontoon assembly insures its full efficiency in rough weather because of the fact that it will 7 be submerged at all times.

provide a boat structure that will olfera minimum of propulsion resistance at relatlvely high speeds.

A further object of my invention consists in providing a construction that will insure full efficiency from the power being supplied for propelling the same, due to the fact that the propeller will be submerged to the full wheel depth at all times, and further due to device consists in providing a structure that p -may be turned with greatest freedom of movement, and within a mlnlmum of turnlng radius.

With these and incidental objects in view,

r the invention consists in certain novel fea- F0 tures of constructlon and comblnatlon of One of the objects of my invention is to parts, the essential elements of which are set forth in the appended claim, and a preferred form of embodiment of which is hereinafter shown with reference to the drawings which accompany and .form a part of this specification. v In the drawings: a Fig. l is a side elevation of a relatively large boat shown assembled and in upright position in thewater.

Fig. 2 is an. end viewof-the mechanism illustrated in Fig. 1. I p 1 Fig. 3 is a sectional, plan view of the assembled device, the same being taken on line 33 of Fig. 1 looking in the direction indicated- Fig. 4 is a side view of a modified form of relatively small stream lined, submersible pontoons dependingfroma relatively large,

multifaced pontoon above whichthe boat hull 7o normally rides and superposed above the nor-, mal water line.

Fig. 5 is-a cross sectional view, taken on line 5-5 of Fig.4, looking in the direction indid 2 Fig. dis a longitudinal,sectional, sideview of oneof the pontoons illustrating the same 1 in preferred embodiment.

Fig. 7 is a side elevation of a relatively small pleasure boat illustrating a plurality of pontoons depending therefrom that are normally submerged.

Like reference characters refer to like parts throughout the several views. v

I preferably form my boat ofa plurality of submersible-pontoons 1, rigidly secured together by strut .fastenings 2, the same being depended from the under side of the hull 3. Each of the pontoons is secured rigidly together by struts or by any other suitable fastening means and the pontoon assembly is secured to the under side of the hull by. any suitable fastening means as byhollow webs or hollow struts 4. These large I webs or struts areplaced central of the pontoons and lighter struts5 extend from the tips or ends of the pontoons to each other and to thehull.

An engine carrying hollow strut 4A is rig-' idly' secured centrally of the underside of the hull and also secured centrally of and to the centrally disposed pontoon, and adapted to maintain the prime mover for the ship. A propeller extends outwardly from the engine carrying strut. Heretofore it has been the general custom to place the propeller at or near the stem of a vessel but 1 have found that more-satisfactory results are obtained when the propeller is disposed slightly astern of the central portion of the ship as shown in Fig. l. The stream line of the flow of the water through and between the pontoon develops a maximum power ap plication to the direct propelling of the assembly through the water. The pontoons normally have sufiicient buoyancy to maintaint'hehull entirely out'of the water andthe constructionof the pontoons so as to have a plurality of faces, both 'top and bottom, that are substantially equal in area and adapted .to being normally submerged, prevents rougher surface water from unduly agitating the hull which normally rides free and clear of the-surface, thereby stabilizing the hull in relatively rough water. The major portion of the pontoons is normally'maintained submerged with the broad surfaces of the pontoons being disposed at the'top and bottom of the ponto ons. Rough water striking the under surface ofthe boat hull will exert a lifting energy to the pontoons. The pontoons being relatively broad'a'ttheir'top and bottom surface offer a maximum resistance "to an up and down movement being imparted to the hulland at the same timeofieraminimum of resistanceto the driving of thesame through the waterby'power means.

I have found splendid results'areobtained wherein the device is made as illustrated in Fig. 4,illustrating-a relatively large pontoon 6 disposed immediately below the hull 7 with a plurality of web s'truts disposed between the pontoon 6andthe hull 7, The hull 7 is superposed the pontoon '6 and a part of the uppersurface of thepontoon is normally-out of the water and not submerged entirely therein. A plurality of smaller pontoons 9 are disposed below the cei itral pontoon 6.

While "the shown and'described is admirably adaptedto fulfill the-objects primarily stated,'it is to be "understood that it is not intended to conlinethe inventionto the one form of embodiment herein shown and described, as it is susceptible of embodiment in various forms, all coming within the scope of the claim 7 which follows I What Tclaim is: w A watercraft comprising a hull, a main pontoon disposed "centrally under the hull,

pairs of pontoons of smallerdimension disposed intermediate between the hull and the main pontoon, said pontoons "being in differentp'lanes and arranged so that-the greatest -vertical resistance is centrally of the watercraft, an engine-carrying strut disposed form of mechanism herein HENRY K. STACK. 

